Batch overview command removed; org cadence override added

9fae093: releases admin org update --overview-cadence <days|auto> — pin an org's automated overview-regen cadence (1–90 days) or clear back to the velocity-tiered automatic default; releases admin org get shows the override when set (buildinternet/releases#1895).
cb01cc2: Removed releases admin overview batch — its API route was retired in buildinternet/releases#1902; use the automated overview regen (per-org cadence) or --overview-cadence instead.